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Re: [quicwg/base-drafts] amplification attack using Retry and VN triggered by coalesced Initial packets (#2259)

Nick Banks <notifications@github.com> Thu, 27 December 2018 16:05 UTC

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Subject: Re: [quicwg/base-drafts] amplification attack using Retry and VN triggered by coalesced Initial packets (#2259)
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I agree this could be a problem if an implementation processes each packet completely independently such as the following text requires:

> The receiver of coalesced QUIC packets MUST individually process each QUIC packet and separately acknowledge them, as if they were received as the payload of different UDP datagrams.

I think the best way to handle this would be to add some text that specifically states that if a server sends a Retry or VN in response to a QUIC packet, the rest of the UDP payload should be discarded.

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